Former MG Rover workers who could lose much of their pensions have been warned to expect no help from the Government.
Most staff can expect to receive at least 90 per cent of what they were due despite the collapse of the Birmingham car giant, thanks to the intervention of the Treasury's Pensions Protection Fund.
But a small minority who retired in unusual circumstances are set to receive far less.
Ministers have insisted that the scheme strikes " the right balance" between compensating staff and ensuring there is enough cash for the future.
The Birmingham Post revealed the case of former finance director Colin Maycock, of Balsall Common, who worked at Longbridge for 38 years and faces losing two thirds of his entitlement.
He agreed a retirement package with MG Rover allowing him to retire at 55, and to receive a lump sum. However, the agreement will not be honoured by the PPF, which could cut his pension payments by up to two thirds.
In the past, existing pensioners had first claim to a pension fund's assets when a scheme was wound up. But this changed when the PPF was introduced.
At the Commons, MP Richard Burden ( Lab Northfield), whose constituency includes Rover's Longbridge car plant, asked Ministers to look into the problem. But he added: " Problems are arising in relation to people who have taken early retirement...some people could not even achieve the 90 per cent of earnings, subject to the cap, that others below pensionable age will receive."
Pensions Minister Stephen Timms said: "The compensation members receive from the PPF may not be equivalent to the pension they may have been expecting."